How to override mannually price for optional item in configured item

Summary

How to override mannually price for optional item in configured item

Content

I sell configured item with several options. We setup base price for item 20 000 $ and 100 dollars for optional item. When we create SO if we choose the base item and option the whole price will be 20 100$. How i can manually override price for optional item during creation of SO if I want to sell for one time optional item for 50$